Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see the file Documentation/kbuild/kconfig-language.txt in the
   4 # Linux kernel source tree.
   5 #
   6 mainmenu "U-Boot $UBOOTVERSION Configuration"
   7
   8 config UBOOTVERSION
   9         string
  10         option env="UBOOTVERSION"
  11
  12 # Allow defaults in arch-specific code to override any given here
  13 source "arch/Kconfig"
  14
  15 menu "General setup"
  16
  17 config BROKEN
  18         bool
  19         help
  20           This option cannot be enabled. It is used as dependency
  21           for broken and incomplete features.
  22
  23 config LOCALVERSION
  24         string "Local version - append to U-Boot release"
  25         help
  26           Append an extra string to the end of your U-Boot version.
  27           This will show up in your boot log, for example.
  28           The string you set here will be appended after the contents of
  29           any files with a filename matching localversion* in your
  30           object and source tree, in that order.  Your total string can
  31           be a maximum of 64 characters.
  32
  33 config LOCALVERSION_AUTO
  34         bool "Automatically append version information to the version string"
  35         default y
  36         help
  37           This will try to automatically determine if the current tree is a
  38           release tree by looking for Git tags that belong to the current
  39           top of tree revision.
  40
  41           A string of the format -gxxxxxxxx will be added to the localversion
  42           if a Git-based tree is found.  The string generated by this will be
  43           appended after any matching localversion* files, and after the value
  44           set in CONFIG_LOCALVERSION.
  45
  46           (The actual string used here is the first eight characters produced
  47           by running the command:
  48
  49             $ git rev-parse --verify HEAD
  50
  51           which is done within the script "scripts/setlocalversion".)
  52
  53 config CC_OPTIMIZE_FOR_SIZE
  54         bool "Optimize for size"
  55         default y
  56         help
  57           Enabling this option will pass "-Os" instead of "-O2" to gcc
  58           resulting in a smaller U-Boot image.
  59
  60           This option is enabled by default for U-Boot.
  61
  62 config CC_COVERAGE
  63         bool "Enable code coverage analysis"
  64         depends on SANDBOX
  65         help
  66           Enabling this option will pass "--coverage" to gcc to compile
  67           and link code instrumented for coverage analysis.
  68
  69 config DISTRO_DEFAULTS
  70         bool "Select defaults suitable for booting general purpose Linux distributions"
  71         select AUTO_COMPLETE
  72         select CMDLINE_EDITING
  73         select CMD_BOOTI if ARM64
  74         select CMD_BOOTZ if ARM && !ARM64
  75         select CMD_DHCP if CMD_NET
  76         select CMD_ENV_EXISTS
  77         select CMD_EXT2
  78         select CMD_EXT4
  79         select CMD_FAT
  80         select CMD_FS_GENERIC
  81         select CMD_PART if PARTITIONS
  82         select CMD_PING if CMD_NET
  83         select CMD_PXE if NET
  84         select ENV_VARS_UBOOT_CONFIG
  85         select HUSH_PARSER
  86         select SUPPORT_RAW_INITRD
  87         select SYS_LONGHELP
  88         imply CMD_MII if NET
  89         imply USB_STORAGE
  90         imply USE_BOOTCOMMAND
  91         help
  92           Select this to enable various options and commands which are suitable
  93           for building u-boot for booting general purpose Linux distributions.
  94
  95 config ENV_VARS_UBOOT_CONFIG
  96         bool "Add arch, board, vendor and soc variables to default environment"
  97         help
  98           Define this in order to add variables describing the
  99           U-Boot build configuration to the default environment.
 100           These will be named arch, cpu, board, vendor, and soc.
 101           Enabling this option will cause the following to be defined:
 102           - CONFIG_SYS_ARCH
 103           - CONFIG_SYS_CPU
 104           - CONFIG_SYS_BOARD
 105           - CONFIG_SYS_VENDOR
 106           - CONFIG_SYS_SOC
 107
 108 config NR_DRAM_BANKS
 109         int "Number of DRAM banks"
 110         default 4
 111         help
 112           This defines the number of DRAM banks.
 113
 114 config SYS_BOOT_GET_CMDLINE
 115         bool "Enable kernel command line setup"
 116         help
 117           Enables allocating and saving kernel cmdline in space between
 118           "bootm_low" and "bootm_low" + BOOTMAPSZ.
 119
 120 config SYS_BOOT_GET_KBD
 121         bool "Enable kernel board information setup"
 122         help
 123           Enables allocating and saving a kernel copy of the bd_info in
 124           space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
 125
 126 config SYS_MALLOC_F
 127         bool "Enable malloc() pool before relocation"
 128         default y if DM
 129
 130         help
 131           Before relocation, memory is very limited on many platforms. Still,
 132           we can provide a small malloc() pool if needed. Driver model in
 133           particular needs this to operate, so that it can allocate the
 134           initial serial device and any others that are needed.
 135
 136 config SYS_MALLOC_F_LEN
 137         hex "Size of malloc() pool before relocation"
 138         depends on SYS_MALLOC_F
 139         default 0x1000 if AM33XX
 140         default 0x2800 if SANDBOX
 141         default 0x400
 142         help
 143           Before relocation, memory is very limited on many platforms. Still,
 144           we can provide a small malloc() pool if needed. Driver model in
 145           particular needs this to operate, so that it can allocate the
 146           initial serial device and any others that are needed.
 147
 148 config SYS_MALLOC_LEN
 149         hex "Define memory for Dynamic allocation"
 150         depends on ARCH_ZYNQ || ARCH_VERSAL || ARCH_STM32MP
 151         help
 152           This defines memory to be allocated for Dynamic allocation
 153           TODO: Use for other architectures
 154
 155 config SPL_SYS_MALLOC_F_LEN
 156         hex "Size of malloc() pool in SPL before relocation"
 157         depends on SYS_MALLOC_F
 158         default 0x2800 if RCAR_GEN3
 159         default SYS_MALLOC_F_LEN
 160         help
 161           Before relocation, memory is very limited on many platforms. Still,
 162           we can provide a small malloc() pool if needed. Driver model in
 163           particular needs this to operate, so that it can allocate the
 164           initial serial device and any others that are needed.
 165
 166 config TPL_SYS_MALLOC_F_LEN
 167         hex "Size of malloc() pool in TPL before relocation"
 168         depends on SYS_MALLOC_F
 169         default SYS_MALLOC_F_LEN
 170         help
 171           Before relocation, memory is very limited on many platforms. Still,
 172           we can provide a small malloc() pool if needed. Driver model in
 173           particular needs this to operate, so that it can allocate the
 174           initial serial device and any others that are needed.
 175
 176 config SPL_SIZE_LIMIT
 177         int "Maximum size of SPL image"
 178         depends on SPL
 179         default 0
 180         help
 181           Specifies the maximum length of the U-Boot SPL image.
 182           If this value is zero, it is ignored.
 183
 184 menuconfig EXPERT
 185         bool "Configure standard U-Boot features (expert users)"
 186         default y
 187         help
 188           This option allows certain base U-Boot options and settings
 189           to be disabled or tweaked. This is for specialized
 190           environments which can tolerate a "non-standard" U-Boot.
 191           Use this only if you really know what you are doing.
 192
 193 if EXPERT
 194         config SYS_MALLOC_CLEAR_ON_INIT
 195         bool "Init with zeros the memory reserved for malloc (slow)"
 196         default y
 197         help
 198           This setting is enabled by default. The reserved malloc
 199           memory is initialized with zeros, so first malloc calls
 200           will return the pointer to the zeroed memory. But this
 201           slows the boot time.
 202
 203           It is recommended to disable it, when CONFIG_SYS_MALLOC_LEN
 204           value, has more than few MiB, e.g. when uses bzip2 or bmp logo.
 205           Then the boot time can be significantly reduced.
 206           Warning:
 207           When disabling this, please check if malloc calls, maybe
 208           should be replaced by calloc - if one expects zeroed memory.
 209
 210 config TOOLS_DEBUG
 211         bool "Enable debug information for tools"
 212         help
 213           Enable generation of debug information for tools such as mkimage.
 214           This can be used for debugging purposes. With debug information
 215           it is possible to set breakpoints on particular lines, single-step
 216           debug through the source code, etc.
 217
 218 endif # EXPERT
 219
 220 config PHYS_64BIT
 221         bool "64bit physical address support"
 222         help
 223           Say Y here to support 64bit physical memory address.
 224           This can be used not only for 64bit SoCs, but also for
 225           large physical address extension on 32bit SoCs.
 226
 227 config BUILD_ROM
 228         bool "Build U-Boot as BIOS replacement"
 229         depends on X86
 230         help
 231           This option allows to build a ROM version of U-Boot.
 232           The build process generally requires several binary blobs
 233           which are not shipped in the U-Boot source tree.
 234           Please, see doc/README.x86 for details.
 235
 236 config SPL_IMAGE
 237         string "SPL image used in the combined SPL+U-Boot image"
 238         default "spl/boot.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 239         default "spl/u-boot-spl.bin"
 240         help
 241           Select the SPL build target that shall be generated by the SPL
 242           build process (default spl/u-boot-spl.bin). This image will be
 243           used to generate a combined image with SPL and main U-Boot
 244           proper as one single image.
 245
 246 config BUILD_TARGET
 247         string "Build target special images"
 248         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_ARRIA10
 249         default "u-boot-with-spl.sfp" if TARGET_SOCFPGA_GEN5
 250         default "u-boot-spl.kwb" if ARCH_MVEBU && SPL
 251         default "u-boot-elf.srec" if RCAR_GEN3
 252         default "u-boot.itb" if SPL_LOAD_FIT && ARCH_SUNXI
 253         default "u-boot.kwb" if KIRKWOOD
 254         default "u-boot-with-spl.bin" if ARCH_AT91 && SPL_NAND_SUPPORT
 255         help
 256           Some SoCs need special image types (e.g. U-Boot binary
 257           with a special header) as build targets. By defining
 258           CONFIG_BUILD_TARGET in the SoC / board header, this
 259           special image will be automatically built upon calling
 260           make / buildman.
 261
 262 endmenu         # General setup
 263
 264 menu "Boot images"
 265
 266 config ANDROID_BOOT_IMAGE
 267         bool "Enable support for Android Boot Images"
 268         default y if FASTBOOT
 269         help
 270           This enables support for booting images which use the Android
 271           image format header.
 272
 273 config FIT
 274         bool "Support Flattened Image Tree"
 275         select MD5
 276         select SHA1
 277         help
 278           This option allows you to boot the new uImage structure,
 279           Flattened Image Tree.  FIT is formally a FDT, which can include
 280           images of various types (kernel, FDT blob, ramdisk, etc.)
 281           in a single blob.  To boot this new uImage structure,
 282           pass the address of the blob to the "bootm" command.
 283           FIT is very flexible, supporting compression, multiple images,
 284           multiple configurations, verification through hashing and also
 285           verified boot (secure boot using RSA).
 286
 287 if FIT
 288
 289 config FIT_EXTERNAL_OFFSET
 290         hex "FIT external data offset"
 291         default 0x0
 292         help
 293           This specifies a data offset in fit image.
 294           The offset is from data payload offset to the beginning of
 295           fit image header. When specifies a offset, specific data
 296           could be put in the hole between data payload and fit image
 297           header, such as CSF data on i.MX platform.
 298
 299 config FIT_ENABLE_SHA256_SUPPORT
 300         bool "Support SHA256 checksum of FIT image contents"
 301         default y
 302         select SHA256
 303         help
 304           Enable this to support SHA256 checksum of FIT image contents. A
 305           SHA256 checksum is a 256-bit (32-byte) hash value used to check that
 306           the image contents have not been corrupted. SHA256 is recommended
 307           for use in secure applications since (as at 2016) there is no known
 308           feasible attack that could produce a 'collision' with differing
 309           input data. Use this for the highest security. Note that only the
 310           SHA256 variant is supported: SHA512 and others are not currently
 311           supported in U-Boot.
 312
 313 config FIT_SIGNATURE
 314         bool "Enable signature verification of FIT uImages"
 315         depends on DM
 316         select HASH
 317         select RSA
 318         help
 319           This option enables signature verification of FIT uImages,
 320           using a hash signed and verified using RSA. If
 321           CONFIG_SHA_PROG_HW_ACCEL is defined, i.e support for progressive
 322           hashing is available using hardware, then the RSA library will use
 323           it. See doc/uImage.FIT/signature.txt for more details.
 324
 325           WARNING: When relying on signed FIT images with a required signature
 326           check the legacy image format is disabled by default, so that
 327           unsigned images cannot be loaded. If a board needs the legacy image
 328           format support in this case, enable it using
 329           CONFIG_IMAGE_FORMAT_LEGACY.
 330
 331 config FIT_SIGNATURE_MAX_SIZE
 332         hex "Max size of signed FIT structures"
 333         depends on FIT_SIGNATURE
 334         default 0x10000000
 335         help
 336           This option sets a max size in bytes for verified FIT uImages.
 337           A sane value of 256MB protects corrupted DTB structures from overlapping
 338           device memory. Assure this size does not extend past expected storage
 339           space.
 340
 341 config FIT_ENABLE_RSASSA_PSS_SUPPORT
 342         bool "Support rsassa-pss signature scheme of FIT image contents"
 343         depends on FIT_SIGNATURE
 344         default n
 345         help
 346           Enable this to support the pss padding algorithm as described
 347           in the rfc8017 (https://tools.ietf.org/html/rfc8017).
 348
 349 config FIT_VERBOSE
 350         bool "Show verbose messages when FIT images fail"
 351         help
 352           Generally a system will have valid FIT images so debug messages
 353           are a waste of code space. If you are debugging your images then
 354           you can enable this option to get more verbose information about
 355           failures.
 356
 357 config FIT_BEST_MATCH
 358         bool "Select the best match for the kernel device tree"
 359         help
 360           When no configuration is explicitly selected, default to the
 361           one whose fdt's compatibility field best matches that of
 362           U-Boot itself. A match is considered "best" if it matches the
 363           most specific compatibility entry of U-Boot's fdt's root node.
 364           The order of entries in the configuration's fdt is ignored.
 365
 366 config FIT_IMAGE_POST_PROCESS
 367         bool "Enable post-processing of FIT artifacts after loading by U-Boot"
 368         depends on TI_SECURE_DEVICE
 369         help
 370           Allows doing any sort of manipulation to blobs after they got extracted
 371           from FIT images like stripping off headers or modifying the size of the
 372           blob, verification, authentication, decryption etc. in a platform or
 373           board specific way. In order to use this feature a platform or board-
 374           specific implementation of board_fit_image_post_process() must be
 375           provided. Also, anything done during this post-processing step would
 376           need to be comprehended in how the images were prepared before being
 377           injected into the FIT creation (i.e. the blobs would have been pre-
 378           processed before being added to the FIT image).
 379
 380 if SPL
 381
 382 config SPL_FIT
 383         bool "Support Flattened Image Tree within SPL"
 384         depends on SPL
 385         select SPL_OF_LIBFDT
 386
 387 config SPL_FIT_PRINT
 388         bool "Support FIT printing within SPL"
 389         depends on SPL_FIT
 390         help
 391           Support printing the content of the fitImage in a verbose manner in SPL.
 392
 393 config SPL_FIT_SIGNATURE
 394         bool "Enable signature verification of FIT firmware within SPL"
 395         depends on SPL_DM
 396         select SPL_FIT
 397         select SPL_RSA
 398
 399 config SPL_LOAD_FIT
 400         bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
 401         select SPL_FIT
 402         help
 403           Normally with the SPL framework a legacy image is generated as part
 404           of the build. This contains U-Boot along with information as to
 405           where it should be loaded. This option instead enables generation
 406           of a FIT (Flat Image Tree) which provides more flexibility. In
 407           particular it can handle selecting from multiple device tree
 408           and passing the correct one to U-Boot.
 409
 410 config SPL_LOAD_FIT_FULL
 411         bool "Enable SPL loading U-Boot as a FIT (full fitImage features)"
 412         select SPL_FIT
 413         help
 414           Normally with the SPL framework a legacy image is generated as part
 415           of the build. This contains U-Boot along with information as to
 416           where it should be loaded. This option instead enables generation
 417           of a FIT (Flat Image Tree) which provides more flexibility. In
 418           particular it can handle selecting from multiple device tree
 419           and passing the correct one to U-Boot.
 420
 421 config SPL_FIT_IMAGE_POST_PROCESS
 422         bool "Enable post-processing of FIT artifacts after loading by the SPL"
 423         depends on SPL_LOAD_FIT
 424         help
 425           Allows doing any sort of manipulation to blobs after they got extracted
 426           from the U-Boot FIT image like stripping off headers or modifying the
 427           size of the blob, verification, authentication, decryption etc. in a
 428           platform or board specific way. In order to use this feature a platform
 429           or board-specific implementation of board_fit_image_post_process() must
 430           be provided. Also, anything done during this post-processing step would
 431           need to be comprehended in how the images were prepared before being
 432           injected into the FIT creation (i.e. the blobs would have been pre-
 433           processed before being added to the FIT image).
 434
 435 config SPL_FIT_SOURCE
 436         string ".its source file for U-Boot FIT image"
 437         depends on SPL_FIT
 438         help
 439           Specifies a (platform specific) FIT source file to generate the
 440           U-Boot FIT image. This could specify further image to load and/or
 441           execute.
 442
 443 config SPL_FIT_GENERATOR
 444         string ".its file generator script for U-Boot FIT image"
 445         depends on SPL_FIT
 446         default "board/sunxi/mksunxi_fit_atf.sh" if SPL_LOAD_FIT && ARCH_SUNXI
 447         default "arch/arm/mach-rockchip/make_fit_atf.py" if SPL_LOAD_FIT && ARCH_ROCKCHIP
 448         help
 449           Specifies a (platform specific) script file to generate the FIT
 450           source file used to build the U-Boot FIT image file. This gets
 451           passed a list of supported device tree file stub names to
 452           include in the generated image.
 453
 454 endif # SPL
 455
 456 endif # FIT
 457
 458 config IMAGE_FORMAT_LEGACY
 459         bool "Enable support for the legacy image format"
 460         default y if !FIT_SIGNATURE
 461         help
 462           This option enables the legacy image format. It is enabled by
 463           default for backward compatibility, unless FIT_SIGNATURE is
 464           set where it is disabled so that unsigned images cannot be
 465           loaded. If a board needs the legacy image format support in this
 466           case, enable it here.
 467
 468 config OF_BOARD_SETUP
 469         bool "Set up board-specific details in device tree before boot"
 470         depends on OF_LIBFDT
 471         help
 472           This causes U-Boot to call ft_board_setup() before booting into
 473           the Operating System. This function can set up various
 474           board-specific information in the device tree for use by the OS.
 475           The device tree is then passed to the OS.
 476
 477 config OF_SYSTEM_SETUP
 478         bool "Set up system-specific details in device tree before boot"
 479         depends on OF_LIBFDT
 480         help
 481           This causes U-Boot to call ft_system_setup() before booting into
 482           the Operating System. This function can set up various
 483           system-specific information in the device tree for use by the OS.
 484           The device tree is then passed to the OS.
 485
 486 config OF_STDOUT_VIA_ALIAS
 487         bool "Update the device-tree stdout alias from U-Boot"
 488         depends on OF_LIBFDT
 489         help
 490           This uses U-Boot's serial alias from the aliases node to update
 491           the device tree passed to the OS. The "linux,stdout-path" property
 492           in the chosen node is set to point to the correct serial node.
 493           This option currently references CONFIG_CONS_INDEX, which is
 494           incorrect when used with device tree as this option does not
 495           exist / should not be used.
 496
 497 config SYS_EXTRA_OPTIONS
 498         string "Extra Options (DEPRECATED)"
 499         help
 500           The old configuration infrastructure (= mkconfig + boards.cfg)
 501           provided the extra options field. If you have something like
 502           "HAS_BAR,BAZ=64", the optional options
 503             #define CONFIG_HAS
 504             #define CONFIG_BAZ  64
 505           will be defined in include/config.h.
 506           This option was prepared for the smooth migration from the old
 507           configuration to Kconfig. Since this option will be removed sometime,
 508           new boards should not use this option.
 509
 510 config SYS_TEXT_BASE
 511         depends on !NIOS2 && !XTENSA
 512         depends on !EFI_APP
 513         default 0x80800000 if ARCH_OMAP2PLUS || ARCH_K3
 514         default 0x4a000000 if ARCH_SUNXI && !MACH_SUN9I && !MACH_SUN8I_V3S
 515         default 0x2a000000 if ARCH_SUNXI && MACH_SUN9I
 516         default 0x42e00000 if ARCH_SUNXI && MACH_SUN8I_V3S
 517         hex "Text Base"
 518         help
 519           The address in memory that U-Boot will be running from, initially.
 520
 521
 522
 523 config SYS_CLK_FREQ
 524         depends on ARC || ARCH_SUNXI || MPC83xx
 525         int "CPU clock frequency"
 526         help
 527           TODO: Move CONFIG_SYS_CLK_FREQ for all the architecture
 528
 529 config ARCH_FIXUP_FDT_MEMORY
 530         bool "Enable arch_fixup_memory_banks() call"
 531         default y
 532         help
 533           Enable FDT memory map syncup before OS boot. This feature can be
 534           used for booting OS with different memory setup where the part of
 535           the memory location should be used for different purpose.
 536
 537 endmenu         # Boot images
 538
 539 source "api/Kconfig"
 540
 541 source "common/Kconfig"
 542
 543 source "cmd/Kconfig"
 544
 545 source "disk/Kconfig"
 546
 547 source "dts/Kconfig"
 548
 549 source "env/Kconfig"
 550
 551 source "net/Kconfig"
 552
 553 source "drivers/Kconfig"
 554
 555 source "fs/Kconfig"
 556
 557 source "lib/Kconfig"
 558
 559 source "test/Kconfig"